The index structure will give good performance looking up individual packets, but a SACK option can cover arbitrary byte ranges that include multiple packets.

索引结构可以为个别包查找提供良好的性能，但SACK选项可能会覆盖包括多个包在内的任意多的字节数。

youdao

Fill a sack with beans, give it furry ears, and name it something cute like Patti the Platypus or Splash the Whale.

用豆子装满袋子，再给袋子装两只毛茸茸的耳朵，然后给它起个可爱的名字，比如：帕蒂鸭嘴兽或飞溅的鲸鱼。

youdao

Make head teachers at state schools as accountable to parents as their peers at private schools are and give them the same freedoms, notably to sack poor teachers and pay more to good ones.

时公立学校的班主任像私立学校的一样对家长负责，并给他们同样的自由。尤为重要的是，解雇水平低的老师，奖励水平高的老师。

youdao